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Steel Making

Tungsten
Tungsten, as an alloy in steel, has been known and used for a...

Quenching
It is considered good practice to quench alloy steels from th...

The Care Of Carburizing Compounds
Of all the opportunities for practicing economy in the heat-t...

Care In Annealing
Not only will benefits in machining be found by careful anne...

Protective Screens For Furnaces
Workmen needlessly exposed to the flames, heat and glare from...

Temperature For Annealing
Theoretically, annealing should be accomplished at a tempera...

Gas Consumption For Carburizing
Although the advantages offered by the gas-fired furnace for ...

Robert Mushet
Robert (Forester) Mushet (1811-1891), born in the Forest of D...

Effect Of A Small Amount Of Copper In Medium-carbon Steel
This shows the result of tests by C. R. Hayward and A. B. Joh...

The Modern Hardening Room
A hardening room of today means a very different place from ...

Effects Of Proper Annealing
Proper annealing of low-carbon steels causes a complete solu...

Carbon In Tool Steel
Carbon tool steel, or tool steel as it is commonly called, us...

A Satisfactory Luting Mixture
A mixture of fireclay and sand will be found very satisfactor...

Making Steel Balls
Steel balls are made from rods or coils according to size, st...

Annealing Of Rifle Components At Springfield Armory
In general, all forgings of the components of the arms manufa...

Tool Or Crucible Steel
Crucible steel can be annealed either in muffled furnace or b...

Instructions For Working High-speed Steel
Owing to the wide variations in the composition of high-speed...

Steel Can Be Worked Cold
As noted above, steel can be worked cold, as in the case of ...

Restoring Overheated Steel
The effect of heat treatment on overheated steel is shown gra...

Nickel-chromium
A combination of the characteristics of nickel and the charac...



An Automatic Temperature Control Pyrometer






Category: PYROMETRY AND PYROMETERS

Automatic temperature control instruments are similar to the Brown
indicating high resistance pyrometer with the exception that the
pointer is depressed at intervals of every 10 sec. upon contact-making
devices. No current passes through the pointer which simply depresses
the upper contact device tipped with platinum, which in turn comes
in contact with the lower contact device, platinum-tipped, and the
circuit is completed through these two contacts. The current is very
small, about 1/10 amp., as it is only necessary to operate the relay
which in turn operates the switch or valve. A small motor is used to
depress the pointer at regular intervals. The contact-making device
is adjustable throughout the scale range of the instrument, and an
index pointer indicates the point on the instrument at which the
temperature is being controlled. The space between the two contacts
on the high and low side, separated by insulating material, is
equivalent to 1 per cent of the scale range. A control of temperature
is therefore possible within 1 per cent of the total scale range.
Figure 131 shows this attached to a small furnace.





Next: Pyrometers For Molten Metal

Previous: Brown Automatic Signaling Pyrometer



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